Sorry for the emotive title but I have my suspicions that this is exactly what MIL is doing.
DH's dad died in the 80s while working for a charitable foundation, leaving behind 3 sons - 15,13 and 9. He was a popular figure so they kindly set up an ongoing index-linked payment to support his family. This is unusual in itself as I've only ever heard of lump sum death in service payments.
The payments went to DH's Mum even though she had been divorced from his dad for some time. Makes sense as the boys were still young. However, she is still getting these payments to this day. They are now in the region of £1500 per month - they do not go to the sons. In fact, she used the money to retire at 40. She has no money worries which is not the case for her sons.
Surely the money should have been going to the sons once they reached 18? She wasn't a dependent - they were divorced! How can she still be benefiting from his death 45 years later? Something is definitely not right here and she refuses to show anyone the paperwork.
Is there anything that can be done?